Die for forming stump-joints for carriage-bows



(No Model.)

W. DAVIS & W. CASEY.

DIE FOR FORMING STUMP JOINTS FOR. CARRIAGE BOWS.

Ne 369,778. Petented Sept. 13, 1887.

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. ilNrTEn STATES PATENT E icE.

DIE FOR FORMING STUMP-JOINTS FOR CARRlAGE-BOWS.

SPECIFICATION forming part of Letters Patent No. 369.778, datedSeptember 13, 1887,

Application filed April 25, 1887. Serial No. 235,979.

- To all whom it may concern:

' stump-joint.

Be it known that we, WILSON DAVIS and WILLIAM CASEY, both citizens ofthe United States, residing at Southington, in the county of Hartfordand State of Connecticut, have invented certain new and usefulImprovements in Dies for Forming Stump-Joints for Carriage-Bows, ofwhich the following is a specification.

Our invention relates to improvements in dies for forging stump -jointsfor carriagebows; and the objects of our invention are to provide dieswhich can be used practically in an ordinary heading-machine, and ingeneral to facllitate the process of forging said joints and finishingthem when forged.

In the accompanying drawings, Figure l is an elevation'of the face sideof our dies, to gether with the operative end of the punch or header.Fig. 2 is a side elevation of the same with the dies placed together.Figs. 3 and 4 are elevations corresponding with Figs. 1 and2,showingamodification ofour dies and punch. Fig. 5 is an elevation ofan offset blank, the same being one form which is adapted to be forgedin our dies; and Fig. 6 is an elevation of a stumpjoint as forged by thedies, Figs. 1 and 2.

A A designate two die-blocks, each having an extension, a a, betweenwhich the punch or header B reciprocates in forging the joint. We preferto form half of the die-depressions in the confronting face of eachblock. The straight groove 1) is of a size in cross-section equal to thesize of the body 0, Fig. 6, of the At thejunction of said groove and theextension at the side wall of the depression on one side is curvedsubstantially in a quarter-circle, as shown at d. From this point to oneedge of the block the face of the extensions a is continuous, leaving anopening on that side, as shown in Figs. 2 and 4.. In Figs. 1 and 2 aside rib, f, extends upward to the end of the dieblocks and serves as aguide for one edge of the punch. In both forms the punch is of athickness to substantially fill the space between the extensions or a,and contains a semicircular depression, 9, in its end. This depressionis located a little to one side of the middle of the groove 11, so thatashoulder will (N 0 model.)

be formed (when the punch is advanced) at a point opposite the curvedwall (2, while said wall and semicircular depression in the punch willbe practically continuous.

Our dies are designed to be used in any ordinary heading-machinessubstantially like those employed for heading bolts and screws. We usestock'of the same size in crosssection as the body a of the joint to beforged and we can place the heated bar in the machine either when it isstraight or offset a little, as shown in Fig. 5.

The heated bar is placed in the machine and the dies brought togetherupon the bar, with one end projecting the proper distance beyond thecurved wall d. The extensions to a will then bear slightly against twoopposite sides of the bar to support it for its whole length. The punchor header B is then forced upon the stock, upsetting its end into theform shown in Fig. 6, and with the form of dies shown in Figs. 1 and 2throwing out substantially all of the surplus metal at a single point.as at h, Fig. 6. The form of dies in Figs. 3 and 4 operate the same,except that, not being confined by the ribs f, a fin will also be thrownout at that side in case there is an y su rplus metal.

It Will thus be seen that the wliolelength of the blank is supportedupon two sides when it is being headed, and, further, that the two extensions which thus support the blank will also prevent a fin from beingthrown out at the sides thus supported, so that the product requires butlittle finishing.

We are aware that a prior patent shows and describes dies for formingstumpjoints from an offset blank like Fig. 5, the punch having a recesssunk in its face, the dividing-line between the die and punch being inone plane, and we hereby disclaim the same.

WVe claim as our invention-- 1. The herein-described dies and header for2. The herein-described dies and header for forming stump-joints, thesame consisting of the dies having the groove for receiving the bar,with the curved Wall at one side and the 5 extensions 11 a, projectingtherefrom, the ribs ff at one side, and the punch recessed on the endand fitted to said extensions and ribs, substantially as described, andfor the purpose specified.

WILSON DAVIS. WILLIAM CASEY. Witnesses:

VALORUS H. JOHNSON, MARCUS H. HOLOOMB.

